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CHERNOBYL, UKRAINE - NOVEMBER 29: Hans Blix, former chairman of the International Atomic Energy Agency, speaks at a ceremony to mark the positioning of the New Safe Confinement sarcophagus over the destroyed reactor number four at the Chernobyl nuclear power station on November 29, 2016 in Chernobyl, Ukraine. On April 26, 1986 workers at the Chernobyl nuclear power plant inadvertantly caused a meltdown in reactor number four, causing it to explode and send a toxic cocktail of radioactive fallout into the atmosphere in the world's worst civilian nuclear incident. (Photo by Brendan Hoffman/Getty Images)